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Watertown, MA -- Two suspects in the Boston Marathon bombing -- identified to The Associated Press as coming from the Russian region near Chechnya -- killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said.

Massachusetts State Police say the two men, who are brothers, spent the night in a Honda CRV and used it to carjack a Mercedes SUV.

Police said Friday morning at a Watertown news conference that one of the brothers stayed with the carjacking victim for a few minutes and then let him go.

They say one brother drove away in the CRV, and the other one drove away in the Mercedes.

Police say one then ditched the CRV and reunited with his brother in the Mercedes. Authorities say both suspects were in the Mercedes when they encountered police and hurled explosives at officers.

The CRV was later recovered in Boston.

A law enforcement intelligence bulletin obtained by the AP identified the surviving bomb suspect as Dzhokhar A. Tsarnaev, 19, - the man wearing the white hat - of Cambridge, MA.

A U.S. law enforcement official and the uncle of the suspects in the Boston Marathon bombings are confirming that the name of the other suspect is Tamerlan Tsarnaev, the older brother of Dzhokhar A. Tsarnaev, 19. Tamerlan Tsarnaev was killed in a gun battle with police in Massachusetts overnight.

Three law enforcement officials, speaking on condition of anonymity due to the sensitivity of the ongoing investigation, confirmed the bomb suspects were brothers. One of the officials and the men's uncle confirmed the identity of Tamerlan Tsarnaev.

The uncle, Ruslan Tsarni of Montgomery Village, MD, told The Associated Press that the men lived together near Boston and have been in the United States for about a decade. They traveled here together from the Russian region near Chechnya.

Friday, Ruslan Tsarni urged his nephew to turn himself in. He says the family is ashamed. He says he loves the U.S. and respects this country. During a news briefing, he told media outlets that his nephews were "losers."

The father of the suspects in the Boston Marathon bombing claims that his son who is still on the loose is a smart and accomplished young man.

Anzor Tsarnaev spoke with The Associated Press by telephone from the Russian city of Makhachkala on Friday after police said one of his sons, 26-year-old Tamerlan, had been killed in a shootout and the other, Dzhokhar, was being intensely pursued.

"My son is a true angel," the elder Tsarnaev said. "Dzhokhar is a second-year medical student in the U.S. He is such an intelligent boy. We expected him to come on holidays here."

Authorities have identified the transit police officer severely wounded in a shootout with the Boston Marathon bombing suspects.

MBTA Police Chief Paul MacMillan says the wounded officer is 33-year-old Richard Donohue. He is a three-year veteran of the department.

Russia's North Caucasus region has been plagued by an Islamic insurgency stemming from separatist wars in Chechnya.

Original Story (4/18/13 11:20 pm):

Authorities say a campus officer at the Massachusetts Institute of Technology has died from injuries in a shooting on the campus outside Boston.

Cambridge police and the Middlesex District Attorney's office says the officer was responding to a report of a disturbance when he was shot multiple times. He later died at a hospital. His name is not being released at this time.

According to a campus alert issued Thursday night at 10:48 p.m., gunshots were reported near Building 32. Police blocked off the area. Students are asked to stay away from the area and stay indoors until further notice.